Incidence and prognostic implications of PSA persistence and relapse after radical prostatectomy. Population-based study

Background There has been a wide range in incidence of prostate-specific antigen (PSA) persistence and relapse after radical prostatectomy (RP) for prostate cancer (PCa). We aimed to describe incidence and prognostic implications of PSA persistence and relapse. Methods Register-based cohort study in Sweden of men diagnosed with PCa between 2007 and 2020 who underwent RP. Risks were estimated using competing risk cumulative incidence curves. Treatment after persistence or relapse and risk of PCa death and other causes were stratified according to persistence, European Association of Urology relapse risk groups, time to relapse, and life expectancy based on age and comorbidities. Results Among 10,700 men, the 10-year risk of PSA persistence or relapse after RP was 34% (95% CI, 32-35%). Within 12 months of persistence/relapse, 75% of men with persistence, high-risk relapse or early relapse (<2 years) received treatment. The 10-year risk of PCa death ranged from 12% for men with persistence to 2% in men with low-risk relapse, while death from other causes ranged from 11% to 16%. Risk of PCa death was 8.5% after early relapse (<2 years) and 1.4% after late relapse (>5 years). Conclusions This population-based study estimated that one third of men would have PSA persistence or relapse within 10 years from RP. There was a wide range in risk of death from PCa according to cancer characteristics and time to relapse. Risk of death from other causes was substantial. These factors, along with life expectancy, should inform treatment decisions for men with persistence or relapse.